1. What is a Hot Water Storage Calculator?

Definition: This calculator estimates the required storage volume for hot water systems based on peak demand and recovery time.

Purpose: It helps engineers and plumbers design properly sized hot water storage tanks for residential and commercial buildings.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V \) — Storage volume (gallons)
• \( P \) — Peak demand (gallons per hour)
• \( T \) — Recovery time (hours)

Explanation: The peak hourly demand is multiplied by the time needed for the water heater to recover to determine the necessary storage capacity.

3. Importance of Proper Hot Water Storage

Details: Correct sizing ensures adequate hot water supply during peak usage periods while maintaining energy efficiency and preventing system overload.

4. Using the Calculator

Tips: Enter the peak hot water demand in gallons per hour and the recovery time in hours. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine peak demand?
A: Calculate based on fixture counts and usage patterns, or use standard values (e.g., 2-5 gph per person for residential).

Q2: What's typical recovery time?
A: Electric heaters: 1-2 hours, Gas heaters: 0.5-1 hour, but check manufacturer specifications.

Q3: Does this account for simultaneous use?
A: Yes, if your peak demand calculation includes simultaneous fixture use.

Q4: Should I add a safety factor?
A: Consider adding 10-20% to the calculated volume for safety margin and future demand growth.

Q5: How does this relate to heater size?
A: Storage volume works with heater capacity - larger storage can compensate for smaller heaters with longer recovery times.